In the first film of the Spy Kids series, Machete is first seen in a flashback, at his brother's wedding. It seems as though Gregorio and Machete have a lot of conflict between them.
When his brother, Gregorio and Gregorio's wife, Ingrid get captured by Fegan Floop, Carmen and Juni visit him, hoping he will help them to save their parents. Machete refuses to go after Gregorio, but allows his niece and nephew to stay with him, and shows them a one-passenger jet that could get them to Floop's castle. Carmen and Juni take the jet, some of his gadgets, and the map to the castle at night.
Machete appears near the end of the film, when he decides to help the Cortezes against an army of robot children. When asked why he came back, Machete claimed it's the same reason he left. Gregorio no longer remembers the reason and neither does Machete. Machete then cries in his brother's arms.
Spy Kids 2: The Island of Lost Dreams
Machete later builds Carmen and Juni a high-tech treehouse after they became secret agents. Machete then shows some of his latest gadgets: the Spy Watches and the Machete Elastic Wonder. At the end of the film, Carmen claims she can't sing so Machete shows Carmen a Microphone that auto-tunes her voice and Juni a guitar that plays itself. When they are done, Machete informs Carmen that he did not put any Batteries in it and Carmen was actually singing.
Spy Kids 3: Game Over
Machete appears near the end of the flim when he helps battle the Toymaker's video game robots. After the battle, Machete becomes closer with the Cortezes.
Spy Kids: All the Time in the World
Machete makes a cameo appearance in Spy Kids: All the time in the world where he is seen tripping in a laboratory when time is frozen by Danger D'Amo, a.k.a. Armageddon. In a deleted scene, while Cecil and Rebecca are running from two OSS agents, they end up in his labratory, managing to ruin several experiments. As they are found by Machete, he hides them from the OSS agents.
Machete is also the name given to a film also directed by Robert Rodriguez. The Machete character in this much more adult film is also named Machete Cortez (this can be seen while a character is accessing information on Machete on a computer), maintaining continuity across Rodriguez's films. Alexa Vega, who plays Carmen Cortez in the Spy Kids movies, will portray a decidedly different character named Killjoy in the upcoming Machete Kills.